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TraceContextRecord.IsWarning Property

Gets a value indicating whether the trace record is associated with a TraceContext.Warn method call.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public bool IsWarning { get; }

Property Value

Type: System.Boolean
true if the TraceContextRecord is associated with the Warn method call; otherwise, false.

The following code example demonstrates how to check the IsWarning property of a TraceContextRecord to determine whether the message that the record contains was written by a Warn or Write method call. If the trace record is a warning message, a different action is taken than if it is an error message.

<%@ Page language="c#" Trace="true" %>
<script runat="server">
void Page_Load(object sender, EventArgs e)
    // Register a handler for the TraceFinished event.
    Trace.TraceFinished += new 

    try {
        throw new ArgumentException("Trace Test");
    catch (InvalidOperationException ioe) {    
        // You can write an error trace message using the Write method.
        Trace.Write("Exception Handling", "Exception: Page_Load.", ioe);
    catch (ArgumentException ae) {    
        // You can write a warning trace message using the Warn method.
        Trace.Warn("Exception Handling", "Warning: Page_Load.", ae);

// A TraceContextEventHandler for the TraceFinished event.
void OnTraceFinished(object sender, TraceContextEventArgs e)
    TraceContextRecord r = null;    

    // Iterate through the collection of trace records and write 
    // them to the response stream.
    foreach(object o in e.TraceRecords)
        r = (TraceContextRecord)o;
        if (r.IsWarning) {
            Response.Write(String.Format("warning message: {0} <BR>", r.Message));
        else {
            Response.Write(String.Format("error message: {0} <BR>", r.Message));


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.